I'm not sure how widely known this site is, but I really like Bookmooch. I've been able to pick up a lot of books that I wouldn't have gotten otherwise. Sure, the books I really, really want aren't there, but that's to be expected. On the other hand, I've gotten some fun stuff like The Worst-Case Scenario Survival Book. Now I know the best way to fend off an alligator. Never know when I might need that.
Anyway, I like the site. I use it. Wanted to mention it. It's a great way to get rid of books and receive new ones. My initial inventory was made up of a bunch of Dragon Lance novels my brother didn't want anymore. I found out pretty quickly that there were people who were more than eager to take them off my hands. And because I sent them those books, I got a copy of The Big Over Easy by Jasper Fforde, which I'm really enjoying.
Hey, got any cool book resources you use?